JPH08226644A - Combustion device - Google Patents

Abstract

PURPOSE: To eliminate any restriction imposed on the shape of an air supply port of a front plate or a mounting work of a sound deadening material and thereby reduce the noise of a combustion device by controlling automatically a fan in conformity with a rotary speed which has deducted a calculated value stored in a target rotary speed when the front plate of the combustion device is opened. CONSTITUTION: If a water current is generated by opening a hot water outlet faucet when a front plate 3 of a combustion device is removed from a main body case 4, an ON/OFF signal transmitted from a detection device 11 is detected with a rotary speed detection device 10. A correction circuit 20 is used so as to set a corrected rotary speed, from which a calculated value is deducted, to a target rotary speed, thereby controlling a fan 9 and driving the fan in automatic mode based on the corrected rotary speed by way of a fan drive circuit 19. It is, therefore, possible to minimize the shape of an air supply port 1 of the front plate 3 and prevent a combustion failure of the combustion device by controlling the fan 9 so as to keep up with the rotary speed capable of providing a stabilized combustion state. This construction makes it possible to eliminate any restrictions imposed on the shape of the air supply port 1 of the front plate 3 or a mounting operation of a sound deadening material 2 and reduce the noise of the combustion device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device used for a water heater, a heater, etc., which burns gas and gas obtained by vaporizing petroleum.

[0002]

2. Description of the Related Art Conventionally, a combustion device uses a fuel control device such as a proportional control valve in a casing consisting of a front plate having an air supply port and a main body case to change the fuel burned in a burner part. The stable combustion state can be obtained by controlling the blower unit with the rotation speed control device that automatically controls the blower at the target rotation speed corresponding to the fuel supplied by the fuel control device and supplying an appropriate amount of air to the burner section. It was Further, the air supply port on the front plate of the combustion apparatus is made small, or a sound deadening material is attached to block or muffle the sound generated by the combustion apparatus to reduce the noise of the combustion apparatus.

[0003]

However, in recent years, with the downsizing, high density and low NOx of combustion devices, the range in which fuel burns in a stable combustion state has become narrower. In addition, with the noise reduction of the combustion device, it is necessary to reduce the air supply port of the front plate of the combustion device or to attach a sound deadening material or the like to block or muffle the sound generated by the combustion device. On the other hand, the resistance of the air passing through the front plate becomes large, and even if the blower is automatically controlled at the target speed corresponding to the fuel, the amount of air supplied when the front plate is opened and closed is Will be different.

Specifically, when the front plate is removed from the main body case, the air supply resistance of the blower is smaller than when the front plate is attached to the main body case, so the blower is rotated at the target rotation speed. Therefore, an excessive amount of air is supplied as compared with the case where the fuel burns in a stable state.

Therefore, in the above-mentioned conventional structure, when the blower is automatically controlled at the target rotation speed capable of obtaining a stable combustion state when the front plate is closed, the front plate is opened for inspection or repair. There is a problem that the amount of air supplied is large and the flame blows out when the combustion device is operated in the state where the front speed is open. When the blower is automatically controlled, when the combustion device is operated with the front plate closed, there is a problem that the amount of air supplied is small and combustion noise becomes loud, or vibrating combustion occurs. Since the shape of the air supply port of the plate and the attachment of the sound deadening material were restricted, it was difficult to realize low noise of the combustion device.

The present invention has been made to solve the above-mentioned problems of the prior art, and the blower is automatically controlled so that the blower is automatically controlled at a rotational speed capable of automatically obtaining a stable combustion state regardless of the open / closed state of the front plate. It is an object of the present invention to improve the rotational speed control device to eliminate the restrictions on the shape of the air supply port of the front plate and the mounting of the sound deadening material, and realize the noise reduction of the combustion device.

[0007]

In order to achieve the above object, a combustion apparatus of the present invention burns fuel in a casing consisting of a front plate having an air supply port and a sound deadening material, and a main body case. A burner unit, a fuel control device for supplying fuel to the burner unit, a blower for supplying air to the burner unit, and a rotation speed control device for automatically controlling the blower to a target rotation speed corresponding to the fuel supplied by the fuel control device. A detection device for detecting the opening and closing of the front plate, and a rotation speed correction device for automatically controlling the blower to a rotation speed obtained by subtracting a calculated value from the target rotation speed when the front plate is opened by the detection device. Is provided.

Further, the combustion apparatus of the present invention comprises a rotation speed detection device, a rotation speed comparison circuit, and a display device which can be identified from the outside of the casing. When the front plate is closed by the detection device, the output signal of the detection device is output. A display circuit for displaying the rotation speed comparison result of the rotation speed comparison circuit on a display device is provided.

Further, the combustion apparatus of the present invention is provided with a timer in the rotation speed comparison circuit, and when the front plate is closed by the detection device and the rotation speed of the blower does not match the target rotation speed for a certain time or longer, the burner is used. The part is provided with a safety device for stopping the supply of fuel.

[0010]

The present invention automatically detects the state of the front plate of the casing consisting of the main body case and the front plate by the detection device for detecting the opening / closing of the front plate, and controls the rotation speed when the front plate is closed. A stable combustion state can be obtained by automatically controlling the blower to the target speed corresponding to the fuel supplied by the fuel control device by the device, and when the front plate is opened,
A stable combustion state can be obtained by automatically controlling the blower to the number of revolutions obtained by subtracting the calculated value from the target number of revolutions set by the compensator, regardless of the open / closed state of the front plate. Since a stable combustion state can be automatically obtained, there is no restriction on the shape of the air supply port of the front plate or the attachment of the sound deadening material, and the noise reduction of the combustion device can be realized.

The second function is to provide a rotation speed detection device, a rotation speed comparison circuit, a display device and a display circuit which can be distinguished from the outside of the casing, and when the front plate is closed by the detection device, the output of the detection device is output. While displaying the signal on the display device, the rotation speed detection device detects the rotation speed of the blower, the rotation speed comparison circuit compares the actual rotation speed with the target rotation speed, and the rotation speed is within a preset error range. Then, by displaying it on the display device, it can be confirmed that the blower is rotating at the target rotation speed when the front plate is closed, so the rotation speed obtained by subtracting the calculated value from the target rotation speed is the target rotation speed. The safety can be secured even if the size is made much smaller, and the restrictions on the shape of the air supply port of the front plate and the attachment of the sound deadening material are further eliminated, and the noise of the combustion device can be reduced.

A third function is to provide a burner when the rotation speed comparison circuit is equipped with a timer and the detection device closes the front plate when the rotation speed of the blower does not match the target rotation speed for a certain period of time or more. By installing a safety device to stop the fuel supply in the section, when the automatic control of the blower is abnormal and the front plate is blocked, the blower rotates at the target rotation speed minus the calculated value. Even though the combustion device can be prevented from being damaged, safety can be secured even if the number of revolutions obtained by subtracting the calculated value from the target number of revolutions is significantly smaller than the target number of revolutions, and the shape of the air supply port of the front plate It is possible to further reduce the noise of the combustion device by eliminating the restriction on the attachment of the sound deadening material.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram showing the construction of a combustion apparatus according to the first embodiment of the present invention.

In FIG. 1, a burner 6, a heat exchanger 7 for heating water, and a burner 6 are filled with fuel in a casing 5 consisting of a front plate 3 having an air supply port 1 and a sound deadening material 2, and a main body case 4. A fuel supply device 8 to be supplied, a blower 9 to supply combustion air, a rotation speed control device 10 for controlling the rotation speed of the blower, and a detection device 11 for detecting opening / closing of the front plate are installed. The heat exchanger 7 is provided with a water amount detection device 12, an incoming water temperature detection device 13, and a hot water temperature detection device 14. The fuel supply device 8 includes a fuel supply amount setting circuit 15, a solenoid valve 16 that opens and closes the fuel passage, and a fuel control device 17 that controls the fuel supply amount. The rotation speed control device 10 includes a target rotation speed setting circuit 18, a blower drive circuit 19, and a correction circuit 20. The detection device 11 outputs an ON signal to the rotation speed control device 10 when the front plate 3 is attached to the main body case 4 by a switch or the like for detecting the opening / closing of the front plate, and the front plate 3 is removed from the main body case 4. When it is turned off, an OFF signal is output to the rotation speed control device 10.

FIG. 2 is an operation flowchart of the combustion apparatus according to the first embodiment of the present invention. The operation of the combustion apparatus according to the first embodiment of the present invention will be described below with reference to the operation flowchart of FIG.

When the front plate 3 is attached to the main body case 4, when the water flow occurs due to the opening of the hot water outlet or the like, the water amount detecting device 12 detects the water flow, and the water amount and the incoming water temperature detected by the water amount detecting device 12 are detected. The fuel supply amount setting circuit 15 calculates a fuel supply amount so that a preset hot water temperature is obtained from the inlet water temperature detected by the device 13, the solenoid valve 16 is opened, and the fuel control device 17 sends a predetermined fuel to the burner 6. Is supplied, the rotation speed control device 10 detects the ON signal of the detection device 11, and the front plate 3 is connected to the main body case 4 in response to the fuel supplied by the fuel control device 17 in the target rotation speed setting circuit 18. The target rotation speed is set to supply an appropriate amount of air for burning the fuel in a stable state when mounted on the fan, and the blower is controlled through the blower drive circuit 19 to rotate at the target rotation speed.

On the other hand, when the front plate 3 is removed from the main body case 4 and a water flow is generated due to opening of the hot water outlet, etc., an OFF signal of the detecting device 11 is sent.
Is detected, the correction circuit 20 sets a correction rotation number obtained by subtracting the calculated value from the target rotation number, and controls the blower via the blower drive circuit 19 to rotate the blower at the corrected rotation number.

Therefore, according to the combustion apparatus of the first embodiment of the present invention, the blower 9 is automatically controlled to a rotational speed at which a stable combustion state can be obtained regardless of the open / closed state of the front plate 3. The shape of the air supply port 1 of the front plate 3 is significantly reduced by
Even if the amount of air supplied is different between when the front plate is open and when the front plate is closed by using a large amount of the sound deadening material 2, it is possible to prevent the combustion failure of the combustion device. It is possible to reduce the noise of the combustion device because there is no restriction on the attachment of the sound deadening material.

FIG. 3 is a schematic block diagram of the combustion apparatus of the second embodiment of the present invention. The difference from the combustion device of the first embodiment is that a casing 5 consisting of the front plate 3 and the main body case 4 is provided with a rotation speed detection device 21 and a display device 22 that can be discriminated from outside the casing, and a rotation speed comparison circuit 23. And a display circuit 24. The display device 22 is an LED, a lamp, or the like.

FIG. 4 is an operation flowchart of the combustion apparatus according to the second embodiment of the present invention. The operation of the combustion apparatus according to the second embodiment of the present invention will be described below with reference to the operation flowchart of FIG.

When the front panel 3 is attached to the main body case 4 and the actual hot water supply is started by opening the hot water outlet or the like, the display circuit 24 receives the ON signal of the detection device 11 and the LED of the display device 22 and the like. Turn on the lamp etc. Further, the rotation speed control device 10 controls the blower 9 to rotate it at the target rotation speed, the rotation speed detection device 21 detects the actual rotation speed of the blower 9, and the rotation speed comparison circuit 23 compares it with the target rotation speed. If it is rotating within the preset error range, the display device 22
Turn on other LEDs and lamps. Since the display device 22 is configured to be distinguishable from the outside of the casing 5, it is possible to easily confirm whether the LEDs or lamps of the display device 22 are turned on or off. If both the display devices 22 are turned on, the combustion device is You can confirm that it is operating normally. Also,
When the front plate 3 is attached to the body case 4, the front plate 3
It is possible to easily confirm that the open / close state of the fan is not detected by the detection device 11 and that the blower 9 is not actually rotating at the target rotation speed due to a failure of the rotation speed control device 10 or the blower 9. It is possible to prevent the abnormality of the device.

FIG. 5 shows a schematic configuration diagram of a combustion apparatus according to a third embodiment of the present invention. The difference from the combustion device of the second embodiment is that the rotation speed comparison circuit 23 is provided with a timer and the burner 6 is provided with a safety device 25 for stopping the supply of fuel.

FIG. 6 is an operation flowchart of the combustion apparatus according to the third embodiment of the present invention. The operation of the combustion apparatus according to the third embodiment of the present invention will be described below with reference to the operation flowchart of FIG.

When the front panel 3 is attached to the main body case 4 and the actual hot water supply is started by opening the hot water outlet, the blower 9 is controlled by the rotation speed control device 10 in response to the ON signal of the detection device 11. Then, the rotation speed detection device 21 detects the actual rotation speed of the blower 9 and the rotation speed comparison circuit 23 compares the rotation speed with the target rotation speed. If it does not fall within the error range, the safety device 25 operates to close the solenoid valve 16 to close the fuel passage and stop the fuel supply to the burner 6. Since the safety of the combustion device can be improved by the second and third embodiments, the safety of the combustion device is secured even if the number of revolutions obtained by subtracting the calculated value from the target number of revolutions is significantly smaller than the target number of revolutions. Therefore, the restrictions on the shape of the air supply port 1 of the front plate 3 and the attachment of the muffling material 2 are further eliminated, and the noise reduction of the combustion device can be realized.

[0025]

As described above, according to the combustion device in the first aspect of the present invention, the following effects can be obtained.

(1) Even if a muffling material is attached to the front plate or the opening area of the air supply port is made small to increase the intake resistance of the intake circuit of the combustion device to reduce noise, the front plate is opened and closed. Regardless, since the blower is controlled to a rotation speed that can automatically obtain a stable combustion state, low noise of the combustion device can be easily performed.

(2) To prevent damage to the combustion device even if the blower rotates at a rotational speed obtained by subtracting the calculated value from the target rotational speed when the front plate is closed due to abnormality in the automatic control of the blower. Therefore, even if the number of revolutions obtained by subtracting the calculated value from the target number of revolutions is significantly smaller than the target number of revolutions, safety can be ensured, and the restrictions on the shape of the air supply port on the front plate and the installation of the silencer are further eliminated. It is possible to reduce the noise by increasing the intake resistance of the intake circuit of the combustion device, and it is possible to realize the noise reduction of the combustion device.

(3) Regardless of the open / closed state of the front plate, a stable combustion state can be automatically obtained, so that the TDR of the combustion device can be made large, and a small amount of hot water can be discharged, which is convenient for the combustion device. Will get better.

According to the combustion device of the second aspect of the present invention, the following effects can be obtained. (1) Since the output signal of the detection device of the combustion device and whether the blower is actually rotating at the target rotation speed can be easily confirmed by the display device, the intake resistance of the intake circuit of the combustion device is increased to reduce noise. However, the abnormality of the combustion device can be prevented, and the noise can be reduced without impairing the safety of the combustion device.

According to the combustion device of the third aspect of the present invention, the following effects can be obtained. (1) By installing a timer for a fixed time to compare the rotation speed of the blower, the safety device malfunctions when the transient rotation speed of the blower changes or when the rotation speed changes momentarily due to wind or other disturbance. Can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a combustion device according to a first embodiment of the present invention.

FIG. 2 is an operation flowchart of the combustion device.

FIG. 3 is a schematic configuration diagram of a combustion device according to a second embodiment of the present invention.

FIG. 4 is an operation flowchart of the combustion device.

FIG. 5 is a schematic configuration diagram of a combustion device according to a third embodiment of the present invention.

FIG. 6 is an operation flowchart of the combustion device.

[Explanation of symbols]

 1 Air Supply Port 2 Noise Reduction Material 3 Front Plate 4 Main Body Case 5 Casing 6 Burner 8 Fuel Supply Device 9 Blower 10 Rotation Speed Control Device 11 Detection Device 18 Target Rotation Speed Setting Circuit 19 Blower Drive Circuit 20 Correction Circuit 21 Rotation Speed Detection Device 22 Display device 23 Rotation speed comparison circuit 24 Display circuit 25 Safety device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Kanazaki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A front plate provided with an air supply port and a sound deadening member, a burner portion provided in a casing composed of a main body case for burning fuel, a fuel control device for supplying fuel to the burner portion, and A blower for supplying air to the burner unit, a rotation speed control device for automatically controlling the blower to a target rotation speed corresponding to the fuel supplied by the fuel control device, a detection device for detecting opening / closing of the front plate, and A combustion device provided with a rotation speed correction device for automatically controlling the blower to a rotation speed obtained by subtracting a calculated value from the target rotation speed when the front plate is opened by the detection device. 2. A rotation speed detection device, a rotation speed comparison circuit, and a display device that can be identified from outside the casing, and an output signal of the detection device and a rotation speed of the rotation speed comparison circuit when the front plate is closed by the detection device. The combustion apparatus according to claim 1, further comprising a display circuit for displaying the number comparison result on the display device. 3. The rotation speed comparison circuit is provided with a timer, and when the front plate is closed by the detection device, when the rotation speed of the blower and the target rotation speed do not match for a certain period of time or more, fuel is supplied to the burner section. The combustion device according to claim 1, further comprising a safety device for stopping.